This wouldn’t end world hunger. This is what would happen long before the robot even reaches the floor of the UN:

• A sandwich company would buy the robot, its design, and its patent, for an incredible amount of money.
• Making a whole robot is redundant, so they’ll refactor the robot to a significantly more scaled down sandwich printing machine.
• The sandwiches will be sold for a very high price, much higher than a regular sandwich, as it can be sold as “ethical”; no animals killed for the meat, no land use for the bread and vegetables. Carbon neutral.
• Company makes HUGE profit margins. World hunger stays the same.

To end world hunger you don’t need to invent infinite food. You need to end capitalism.